Water Level Indicator
Overhead tank level indication with staged LEDs, an audible full alarm and optional automatic pump cut-off.
- Suitable for
- School
- Technology
- Transistor switching
Beginner3–4 days
Arduino · Automation
Automatic Street Light
Street lights that switch on at dusk and off at dawn using light sensing, with an optional motion-based dimming stage.
- Difficulty
- Beginner
- Typical time
- 3–5 days
- Suitable for
- School
Price
Contact for price
Cost depends on components, complexity and which deliverables you need, so we quote after understanding your requirement.
Technologies
- Arduino Uno
- LDR light sensing
- IR motion detection
- PWM dimming
Project overview
A light-dependent resistor feeds a comparator (or an Arduino analogue input, depending on the version you choose) that switches the lamp circuit when ambient light drops below a set level. It is one of the most requested school and diploma projects because the principle is immediately visible: cover the sensor and the lights come on.
The version most students should build adds a second stage — an infrared or ultrasonic sensor that raises the lamps to full brightness only when something passes, and holds them dimmed otherwise. That turns a simple switching circuit into an energy-saving argument you can quantify, which is far stronger in a viva.
Built as a demonstration model at low voltage with LED lamp posts on a road base, so it is safe to carry into a classroom and set up on a table.
Features
- Automatic switching at dusk and dawn from ambient light level
- Optional motion-triggered brightness boost for energy saving
- Adjustable light threshold via a labelled trimmer
- Low-voltage demonstration model, safe for classroom use
- Road base with multiple lamp posts for a realistic demonstration
How it works
- 1The LDR divider produces a voltage that tracks ambient light level.
- 2The controller compares that voltage against the threshold set on the trimmer.
- 3Below the threshold, the lamp driver is enabled and the posts light up.
- 4In the motion-sensing version the lamps sit at reduced brightness until an IR sensor is triggered.
- 5Brightness returns to the dimmed level after a fixed hold-off period.
Components used
- Arduino Uno or Nano
- LDR with reference resistor
- IR obstacle sensors
- LED street lamp posts
- Relay or MOSFET driver stage
- Road base with mounted poles
Questions about this project
Is there a version without programming?
Yes. A comparator-based version using an LDR and an op-amp works without any code, which suits school projects and departments that want discrete electronics.
Can it be demonstrated in a bright classroom?
Yes. The threshold trimmer is set so that covering the sensor with your hand triggers the change, which is the standard way to demonstrate it indoors.
Similar work
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Need the Automatic Street Light in Surat?
Send your class or course and your submission date and we'll confirm what's achievable, what it includes and what it costs — before you commit.